Hi
>ad issue 1: update fTools to warn users when some features cause problems
>ad issue 2: quick fix fTools to convert geometry collections to single
geometry types
A function that takes a geometry type and extracts the longest line /
the largest polygon / the first point from the geometry collection
should be straightforward to do.
>These fixes/updates would be made available as fTools updates via the
plugin installer asap
If the fix does not take too long, we probably don't need a warning at all.
Regards,
Marco
On 23.11.2015 21:35, Anita Graser wrote:
Hi,
If you are following the psc list, you've probably seen the thread
discussing current shortcomings of ftools
(http://lists.osgeo.org/pipermail/qgis-psc/2015-November/003623.html)
In short, the key issues are:
1. When ftools encounter issues with certain features, warning
messages get written to the log but this is largely hidden from users
since they would actively have to actively monitor the log. The
problematic features are then missing from the results but this is not
always obvious.
2. The above issue is more common now (since 2.10) since underlying
libraries more often (and correctly so) produce geometry collections
as outputs. These geometry collections are not handled well by the
current ftools code which is much older.
To address these issues, the following suggestions have been made so far:
ad issue 1: update fTools to warn users when some features cause problems
ad issue 2: quick fix fTools to convert geometry collections to single
geometry types
For the warnings, there's already a first PR draft
https://github.com/qgis/QGIS/pull/2432 which needs to be fleshed out.
These fixes/updates would be made available as fTools updates via the
plugin installer asap.
If you have ideas how to handle this efficiently or have already
implemented code that addresses similar issues, let us know.
It would be good to have a quick discussion in order to be able to
provide improvements fast.
Best wishes,
Anita
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--
Dr. Marco Hugentobler
Sourcepole - Linux & Open Source Solutions
Weberstrasse 5, CH-8004 Zürich, Switzerland
[email protected] http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee
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